The relation existing between psychology and psychiatry has been placed on a very practical basis by the studies of shell shock and other hysterical conditions so important during the recent war. Probably nothing will contribute more towards a recognition of the importance of psychiatry than the discovery made early in the war that mental diseases and defects were responsible for more disabilities than were attributable to almost any other single cause. Certainly the inactivity of many years has been followed by an awakening which has placed modern psychiatry on a dignified plane and its progress will now compare favorably with the accomplishments of any other branch of medicine. The statement is, I think, justified, that psychiatry has been established on a thoroughly scientific basis as the result of the work of comparatively few years. We have, however, reached a stage where careful analyses should be made of the clinical data upon which future progress entirely depends. A brief consideration of existing conditions should be sufficient to show this conclusively. Psychiatric literature is, and for many years has been, characterized largely by an unfortunate absence of accurate scientific information which would warrant the conclusions reached in many instances by the authors of our textbooks. We have been subjected to an avalanche of theories and a remarkable paucity of facts. In the discussion of abstract propositions where concrete evidence is not obtainable this is of course unavoidable. There has, however, been a very noticeable oversight of many facts which the wealth of clinical material in our hospitals has placed at our disposal. Our literature has been filled with too many unsubstantiated statements. There is no reason why many of the views entertained by various authorities should be matters of personal opinion or based entirely on individual observation. The fact that there are over two hundred thousand cases of mental disease in the state hospitals of this country, with an admission rate of sixty thousand annually, is sufficient evidence to justify the statement that there is no lack of material for accurate studies.